Furnace



7 Sheets-Sheet 1 H A LEONHART FURNACE Flled March 31, 1928 L INVENTOR Sept. 25, 1928.

war/(Mai WITNESS: v

Sept. 25, 1928.

H. A. LEONHART FURNACE lNVENTOR fljileonhwrf AT1 ORNEY WITNESS:

Sept. 25, 1928. 1,685,710

' H. A. LEONHART FURNACE Filed March 31, 1928 '7 Sheets-Sheet 5 INVENTOF ATTORNEY WITNESS:

Sept..25, 1928.

H. A. LEONHART u AC 7 Sheets-Sheet 4 Filed March .31, 1928 ATTORNEY Sept. 25, 1928.

H. A. LEONHART FURNACE Filed March 31, 1928 7 Sheets-Sheet '7 ean 7.21 IYNVENTOI v N\ \N \M 14. w g mm w w mx WITNESS:

Patented Sept. 25, 1928.

UNITED STATES 111mm! A. titanium, or BANGOR, wrsconsm.

runnaon.

. Application filed March 31,1928. Serial No. 266,285.

My present invention has reference to a heating plant, and my objectis the provision of a plant for this purpose through whichthe heat is circulated and radiated in such manner to insure a more constant and uniform delivery thereof than can beobtained by the usual construction of such plants withan equal consumption of fuel.

. Another object of the inventionis the provision of a heating plantfor household use that embodies both the hot air and hot water circulating systems; that may employ either hard or soft: coal or wood as a heating agent;

in which the products of combustion from the 15 fuel may be caused to circulate through a.

conduit arranged in the jacket or casing or to be passed directly into thechimney flue as when the fire is first started, and further wherein the gases generated by the fire are controlled in a. manner to insure thesafety of the plant.

A further object is the provision of a heating plant Whose heat conducting ducts r passages may be readily cleaned from the ex- 25 terior of the jacket or casing, which embodies a grate construction of a slmplebut extremely novel nature and which is of such arrangement and construction that the same may be readily set up and will require little if any 30 repairs when in practical use.

The invention will be fully and comprehensively understoodfrom a consideration of the following detailed description when read in connection with the accompanying drawings whichform part of the application, with the understanding. however, that the improvement is capable of extended application and is not-confined to the exact showing of the drawings nor to the precise W construction described and, therefore, such. changes and modifications may be made therefrom as do not affect the spirit of the invention nor exceed the scope thereof as expressed in the appended claims.

In the drawings: 4 j v i I Figure 1 is a side elevation of aheating plant in accordance ,with'my invention, the

jacket or casing being in section. .Figure 2 is a sectional view approximately 7 on the line 2-2 of Figure 1. i

. Figure 3 is a sectional view on the line 3-3 of Figure 2. j j

Figure 4 is a sectional view approximately on the line 4-4 of Figure 3. V

Figure 5 is a sectional view approximately on'the line 5-5 of Figure 4. i

} grate bars.

Figure 6 is a sectional View approximately on the line 66 of Figure 3. I

Figure 7 is a fragmentary elevation looking toward one side of the furnace to illustrate the rocking mechanism for the grates.

F lgure 8 is a fragmentary elevation to illustrate the gas control for the. furnace when soft coal is employed for a fuel.

Figure 9 is a sectional view on the line 9-9 of Figure 8.

Figure 10 is an inner face View of a door for the fire box of the furnace to illustrate the damper and the latching means associated therewith.

Figure 11 is a View substantially similar to Figure .10 but showing the latch swung to locking position. v

- F igure 12 is a sectional view approximately on the line 1212 of Figure 11.

Figure 13 is a sectional View approximately on the line 1313 of Figure 3.

Figure 14 is a sectional view approximately on. the line 1 l14 of Figure 13.

Figure 15 is a sectional view approxin iately on the line 1515 of Figure 3.

Figure 16 is a detail sectional view on the line 16-16 of Figure 15.

Figure 17 is a detail sectional view on the line 17-17 of Figure 1.

Figure 18 is-asectional view approximately on the line 1818 of Figure 17.

Figure 19 is a detail longitudinal sectional View through the heating plant to illustrate the arrangement of one of the grate bars therein. p w I Figure 20 is a top plan view of one of the grate bars. i

Figure 21 is a sectional view approximately on the line 21- 21 of Figure 20.

Figure 22- 'is a sectional view approximately on line 22-22 of Figure 19.

Figure 23 is a sectional view. approximate- 1y on the line 23-23 of Figure 19.

Figure 24 is a sectional View approximately on line 24-24 of Figure 19.

Figure 25 isa perspective view of the rod or tool employed for removing any one of the In the showing of the drawings the furnace 1. is of a substantially rectangular formation and is arranged in but spaced from a jacket or casing 2. The jacket 2 has an open top that is surrounded and engaged by a depending flange 3 upon a radiator or grate 4.

The grate or radiator is let through an opening in the floor 5 of a room above which the v wise secured outwardly directed horizontalr of levers 16 heating lant isv arranged. 'The furnace is lower ash pit and an upper fire boxnxOn'gthe sides of the furnace there'are cast or otherly disposed substantially rectangular frames 6 and 7 respectively. The outer straight face of the frame 7 is disposed in contact with the outer'f ace of one of the sides of the jacket T his, side of the jacket is provided vith alongitudinal openingS whichis coveredby the outer plate of the frame The frame or cast ing'fiis formed with a vertically disposedylon I gitudinally extending plate or partition 9 that is,of'course, connect'edto the endsof-the frame, and"thisjpartition plate 9 is provided with a series of equidistantly spaced 1.1 in the outer side wall o the furi'iace 1. These alining op nings are ceive theret-l'u'ou-gih the thic tions',12 of the outer bearing: grate bars. I The thickened portion 12 of each of the bearingimen'ibers' is formed with aperipheral longitudinally extending rib 13, and these tongues'are designedtob received in notches 14 in the rou-ndedor he d 54 The head lfrof each ot are levers, is, of course, provided with a bore throughwhiclrthe bearing passes; The bearing member is in, the nature of a tube, and thebore thereof is notched, asat 17. Also designed to be received on the b'earin glmembers 12 and having-notches torec'eive the ribs li-lthereof there are washers 18. Thesewashers contact with the inner face of the partit-ion plate 9, and surrounding each bearing 12' and exerting a tension between the head or hub 15, of thelevers 16 and the washer 18 there are coil springs 19, All of the levers 16 are'pivotally connectedto a bar 20, and by l inner por a construction as above described itwi'll be springs 19.

The reduced ends of the'bearin g s 12 are indicated for distinction by the nun'ieral 21 and are received through the op'enhig 8 in the outer elementof the frame 6 and these ends are also received through rounded openings in-plates 22 which are removably secured, preferably through the medium of screws, to the said outerpl'ate of the frame. Surroundingtherednced portion 21 of each of the bearings 12. and exerting-apressure against the plates 22t-hereare-helical springs-23. When it isdesired to move any of the bearings 12 it is merely necessary todetach the connectingelements' for the plates-22, and thereafter insert the IOdQd (Figure 25 through the ,i 'round openings 10 that aline with similar open ngs gned to rehereof the, bearing, and'to bring its hooked cnd25 intothe notch 17, andto exert an out-- ward pull onthe rod which will cause the bearingrtoe'slide ent rely: over or partly over the heads 15 of the levers 16 and the washers V The bore of each of the bearings 12 upon its I inner end-is enlarged and formed with a lontl'ierethrough.

' The second side offlthe'furnace 1- is provided-with round openings n a line wlth the openings 11, and through these openings there is designed'to ice-passed tubular bearings 30. The inner end oi. eachof the bearings '30 is enlargedor headed, as at-31, to contact'withthe inner wall of the said-side" of the fur-nae The outer ends of these bear- .in 's are received throughrounded openings in the outer member ofthe frame 7; Each oft-he tubular bearings is formed with al'om {zitudinally extending groove 32 to receive therein ribs which project into the bores'of the headed portions 32' of levers 38" and washers 8 A helical 'spring 35 surrounds e achof the bearings 30 and exertsa'press'ure between the washers 3 1 and the heads of the levers33. The headed end'3'1 of each 'ofthe bearings 30has an enlargedboreformed'with a, longitudinal grooveto receive therein a rib 37' fornreclon' the second hub ends-"38 of the grate bars 28. v 1hegrate bars 28- are'triangular or su-h stantially-V-sliapedinq cross section and the inn upper and widened facesthereofare formed with transverse ribs 39 that provide the rest for the fuel. Theprojectingi'ends of the r1bs39 in the respective grate bars are, of

. course, designed tobere'ceived between the ribs in the adjacent: grate bars. 1

The levers are eaclr-1Liivotally connected by a bar 40' similar the bar 20 and-the ends of the bars 20 and 1 0"are received between the outer face-of thefurnaceand the faceplate for the said furnace; To these ends'of thebar s there are pivotally connected depending links 41 and 12 ,respectively Thelink tl is-really in the nature of a. lev'er,-'- being projected above its pivotal connection with the bar 20 and to this projecting end 'o-t' tlreylinlfr or lever 41 thereis pivoted-another link 43 which in turn is pivoted tothe grate rocking leverjt li. The link 43, of; course, passes'through; an opening inztlie casing or jacket 2, and the rocking lever 441 is pivoted"'-between---lugs 4 5 onthe face plate 46 for the f'urnace 1;- an arrangement as above described it will be seen that all of the grate' bars"are siniultaneously rocked andthat anv on'eof thegfra't e bars maybe removed w-lifen'injured and're'adily replaced. Aece'ssis'obtained through 'the Byv ill

- may be coupled to'the co ciated therewithis obtained through an opening in the casing2. Thisopening is normally closed by a plate lS, the said plate having-a hooked end 49 to engage one of the walls of the opening and a continuous rib 50 to engage all of the walls of the opening; To look the plate to close the opening a bolt 51 has its headed end passed through a bridge plate 52, that is a plate that contacts with the inner f ce of the casing, and which bolt is engaged .by a nut 53 arranged on the outer face of the closure plate 48.

I Removably secured to one of the inner side 1 walls of a furnace 1, above the grate therein,

there is a water jacket or boiler 54;, and cornmunicating with this boiler there are water inlet and outlet pipes-55 and 56 which, of course, passthrough the side of the fire box. and the casing or jacket and the hot water conducting pipe may be connected with suitable radiators whose return or drain pipes ld water inlet pipe, in the usual manner. I

' The fuel inlet opening in the furnace is closed by the fuel inlet door 47. hingedly sn iported upon an angle frame 57 attached to the face plate 6 by screws or bolts 58, The door 47 provided with a series of openings designed to be covered or uncovered by a slidable 'platel59. The inner face of the door 47 has arranged thereon the usual baffle plate 60, and the said inner face ofthe door has centrally ari'anged thereon. a link (ii to,

which is attached the shaft of a" level or handle ($2. P.ivotallysecu1'ed on the ends of the opening of the doonas disclosedbvFigure 10 of the drawings, and by turning the. lever in a second direction the link will be moved into longitudinal. aline'n'icnt with the latching elements 62 so that the ends of the said elements will lie brought against the-inner edges of the frames to hold the door clos d. The link islimited in its swinging by contact with a stop element (hi on the said inner face of the door. i

The ash pit is also provided with an opening that is controlled by a pivotally sup: ported door 66, the said doorbcin g normally latched and being preferably centrally formed with an opening that is closed by the usual swingable auxiliaryf'door 67.

Above the door 47 the face plate and the outer face ofthe furnacehas an additional opening. Of course, the openings for the doors 47 and 67 are disposed in a line with the hollow l and substantially rectangular spacing rnernbers between the furnace and the face plate. therefor, and the last mentioned opening is arranged in a line with a snnilar spacing openin The last mentioned openmg is partly covered'by a substantially reetangular plate68 that is removably fixed on the face plate 46. The plate 68 has a central opening 69 therethrough, andbridging this opening there is a connecting element 7 0. On the outer face of the plate there is a ring enlaiL-gement 71 and the said enlargement has oppositely disposed peripheral cam extensions 7 2, respectively. 7 Guided through a central opening in the'part there is a pivot pin 7 3. Mounted. for rotation on this pivot pin there is a damper plate 74. The damper plate 74 has a hub extension 75 that is also journaled on the pivot pin 73 and that is received in a hollow boss 76 from which the pivot pin 73 centrally extends. The boss 7 6 really provides the hub of an arm or plate 78 that has inwardly extending angle ends 79 that are connected to the face plate 46 for the furnace. The damper plate 74 is in the nature of a disc and is formed with oppositely pro- :jecting fingers 80 to ride on the cams 7 2 when A pull upon one of the chains will move the damper plate onto the cams to uncover the opening 61 and, a pull upon the second element will move the damperplate to bring its fingers 80 off of the cams. Aicoilspring 84 surrounds the hub of the disc damper 74 and exerts a pressure between the element 76 and the said damper disc. It should here be stated that the damper 74 is only opened when soft coal. is being burned in the furnace and is retained openuntil all of the gases from such fuel is consumed.

The top of thefurnace 1 is open and is provided with a continuous groove that de signed to receive therein a continuous rib 85 on the top or crown plate 86 for the said coils. The plate 86 is cast with the upper and longitudinally extending branch 87 of the 7 heatconducting and radiating conduit. This branch 87 has on its under face depending arched ribs 88 that are apertured and that are connected with the sides of the casing for supporting the branch 87 thereon. The top of the branch 87 is formed with c'loselv related spaced longitudinally extending ribs 8.) between which the heat from the branch 87 radiates. The conduit branch 87 is preferably rectangular in cross section and has its under face at its outer or freeend formed with a projection which isribbed to be re ceived in ,thegrooves in the outer and vertical branch 90 of the conduit. The branch 90 is formed atone end of the lower horizontal branch 91 of the conduit. Supporting the ion lllfi li l lLI

Connected- With t bi-anches and" 91 at the connecting ends 'thei-eofthere ar'eleg" members 92; and stipporting-the inner and closed'endof the branch 9-1 there is a substantially r'eethng'l'ihr c'asti n-g 93' that is bolted; as at 94 to one of the sides of the furnace 1. The upper and lower"lon itudinal or horizoziml branches of the condtl'it' are formed, on'theii' ou ends with reduced extensions 941mm 95,

CLIVE- l y which pass throiig'h'oneside of theeasing. These extensions 94 and 95 are (dosed by plates 9'0, bestillustihted'in Figni' s- 15 and 16' of the di aiv'ii'igs. These phites 'ai'e sthste'iitially similar to the-closure plate 4 8, the said phite's having a contiiitions flange on' theii' inner faces and-having a hooked portion 96 to ongage' with'thecasing. The plates 96", zit-[the ends thereof opposite the ho0'ks'96 havesiottedeXtensions 01* ii s97 that receive there through slotted jlates'oP bail members 98 he casing 22 Through the niem'hei's 98 there are ptssedwedge elements 99' that wedge the Hps of iii-ejections 97 against the (HtSiIfg. The vet eel-branch 90 oi the conduit is p'roviijied 'With an opening that is surronnded bye spacing element that V is received through anopeni'ng in the casing This openingis closed by a cove? p'hzte 100 that is removablysecui'ed 0n the casing 2 by bo1ts'101'."

Surrounding Linopening'in the ioi've'i" horimint-211'b1a1ieh'9'1 of the conduit and secur d to thesnid bran chthei-e is'aninbi'wirdiy diifet'z'ted nngiidiaidy disposed "eon dui iifncl'i' in the nettiife o'f'apipe 102." This'p'i'pe' has an upper angleext'ension 108 designed to be received in an opening-in a, '(Jhinney"hie'zist' and the pass throiii'gh the eit'tensl'oi'i conttoiiedb; elem ope-ii ed newer 10-11 T1 e pipe branch- 102 'oftheconduit, zit the" junc H1130 ofthe t ngle hmneh" thereof is formed with an inwardly directed substantially i-eotnngnlar portion 105. Theonte't' fate of this Preferablyirernova bly secured on" the out"- let end 103 of the bi'aneh" 10201 the conduit theieis a lat rally extendin s lhstintijalij rectangular p1ate'112; This'p1'a'te'112 is bolt ed o'i -sciewed to th'e'inne'r' face 01 the casing 2, and isplovided Wit/11a st'ibstzin'tially rectengulz'i fiopening 118;" The openinglflg'is covered byla" olos'ii'ie' plate 114 which is screwed or bolted tot he outer fiice oft-he' cae mg 2. The plate serves support foi the outlet end 103 of the eonduit, and his the p "'o'p'ei' joinmr'e ofth'e branch 87, with th e said branch 102 and the removable plate 114 peifnnts of access heingobtaine'd w ne in nor of the casing zi'nd'to the top of the'jcoliduits may be readily Clea ed inert and convenient mann'ei'l The nnpi ove'inentmay and hotnii' hei' terl Protision is nizide toigases generated by the fne1s usedinthe furnace, so that suoh ohn'o'xions gasescannot esozipe t hei'efi'dni 01' injnrethe oeehpants oi the dwelling in Which the plant is'in'stalijed. The grate is'of extremely novel consti'iiotion and repairs may beinade in" an easy and eon veniejnt niziin'ier to any one of the grate bays without interfering with the i'en'iiiinder thereof, hen the fire i.s first st-iirtedthe dziinper 1'10 opened sdthat' the gase's and through the Ontle't 10 3." After the' the has burned snfiioiently to" const' in e the gases the (temper plate isclo'sedflso thzit'the heii't units will travel entiieiy through the sui stantia lly rectiingui'ei"conduit befoi'e 'finding an outletthrough theichinniey. V In thisinannei' it will be seen that the entire innep stir} face of the jacket or easing will be effectively heated and such heat wiltb'edireeted thiou'gh the grating-'01 radiator 4. By erely-1 r'egnl'atin'g the damper 104 atontinnonsfand even suppl'y of heat at :1 desired teinjnei'iture will be dii'erztedithiough the grating. or' 'efldiz to 4'; Of coi'ii se, the ater in the boiler 54 W illjbe h'ezited'bj/ the fiire in the f 'iii'iaee'und Will circulate throng-lithe pipes 55 and 56 in a man ner hei'etofoi e described. The hoil'ei fit, upon. its upper face is'pf-efei'tdflyformed with ribs 01 fins 115 which serve as radiators for the heatunits contacting'therewith. K

Having described the invention, I claim:

1. A heating plant comprising fire box,

a' casing surrounding the fire box", a'nd'la grating arranged over the'op'en to'p'of the casing, a heat oireulhting and radiating c'onduit comprising a substantially U shaped member niade up of connected seetionsyand theupp'er branch of the conduit fo-rm ijng't'h'e top of thejfire box, the loiv'ei bianeh of the conduit hitvingn Closed end; supporting means between the lower branch: and t l'iefire -boX ofthe conduit, legs; elsdsn'p potfingthe eondult, transveiseiy efritng ch anchdiiihs on the under faeeofth'efiifppef bra hc'h of the' conduit 'se'enred' to the sides of t e longitudinally extending 'iibs" on" the top o f lfo tinuous rib to be received in said groove, and;

a pivotally supported damper plate for controlling the opening between the said upper branch of the conduit and the pipe member.

2. A heating plant comprising a substantially rectangular fire box having an open top which is grooved, a substantially rectangular casing surrounding the fire box and having one end. in close proximity to the fire box, a grating for the open top of the casing, a heat circulating andradiating conduit in the casing, including an outer horizontally disposed branch having a widened end formed With a continuous tongue to be received in the groove of the fire box and its second end formed with an extension which asses through the casing, a flanged plate aving a hooked end to engage the inner wall of the extension, wedge means locking the plate on said extension, transversely arranged apertured ribs on the under face of the said branch connected to the sides of the casing, equidistantly spaced longitudinally arranged ribs on the top of the said branch, a substantially L-shaped hollow member having a tongue and groove engagement with the first mentioned branch of the conduit and communicating therewith, a frame-like casting on the closed inner endof the lower branch of the L-shaped member bolted to the fire box, legs supporting the outer end of the said member, both the vertical and horizontal branches of the last mentioned member having extensions which are received through Jopenings in the fire box, flanged plates having hooked ends for closing said openings, latching means arranged exteriorly of the casing for locking said plates, a pipe member connected with the lower branch of the conduit and having an outlet end extending through the casing and a damper in said outlet opening, said pipe member having an opening communicating with the upper branch of the conduit, and a hand operated pivot-ally sup ported valve plate for controlling such openmg.

, A heating plant comprising a substantially rettangular lire box having an open top which is grooved, a substantially rectangular casing surrounding the lire box and having one end in close proximity to the'fire box, a grating for the open top of the casing, a heat circulating and radiatingconduit in the casing, including an outer horizontally disposed branch having a widened end formed with a continuous tongue to be received in the groove of the fire box and its second end formed with an extension which passes through the casing, a flanged plate having a hooked end to engage the inner wall of the extension, wedge means locking the plate on said extension, transversely arranged aperture d ribs on the under face of the said branch connected to the sides of the casing, equid" tantly spaced longitudinally arrange-d ribs on the top of thesaid branch, a substantially L-shapcd hollow member having a tongue and groove engagement with the first mentioned branch of the conduit and communicating therewith, a frame-like casting on the closed inner end of the lower branch of the L-shaped member bolted to the lire box, legs supporting the outer end of the said member, both the vertical and horizontal branches of the last mentioned member having extensions which are received through openings in the lire box, flanged plates having hooked ends for closing said openings, latching means arranged exteriorly of the casing for locking said plates, a pipe member connected with the lower branch of the conduit and having an outlet end extending through the casing and a damper in said outlet opening, saidpipe member having an opening communicating with the upper branch of the conduit, and a hand operated pivotally supportedvalve plate for controlling such opening, a boiler in the fire box and inlet and out- .let water pipes passing through the casing and connected with the boiler.

4. A heating plant comprising a substantially rectangular fire box having an open top which is grooved, a substantially rectangular casing surrounding the fire box and having one end in close proximity to the lire box, a grating for the open top of the casing, a heat circulating and radiating conduit in the casing,including an outer horizontally disposed branch havinga widened end formed with a continuous tongue to be received inthe groove of the tire box and its second end formed with an extension which passes through the casing, a flanged plate having a hooked end to engage the inner wall-of the extension, wedge means locking the plate on said extension, transversely arranged apertured ribs on the under face of the said branch connected to the sides of the casing, equidistantly spaced longitudinally arranged ribs on the top ofthe said branch, a substantially L-shaped hollow member having a tongue and groove engagement with the'first men tioned branch of the conduit and communicat-ing therewith, a frame-like casting on the closed inner end ofthe lower branch of the L-shaped member bolted to the fire box, legs ipporting the outer end of the said member, both the vertical and horizontal branches of the lastmentioned member having extensions which. are received through openings in the fire box, flanged plates having hooked ends or dQ ing a d o p n ng la h ng Wan m? ranged exteri orly of the casing for locking said plates, apipr: mamber connected with the lnwer branch Of-the conduit and having an outlet end 'extending through the casing and a damper in said outlefi opening, said pipe memher having an opening communicating with the upper branch offihie conduityand' a. hand op r p mtally suppon d az ve aplat 139v cQn t ling' su h pening, a ba lar in Hm fira a d inl a d nail t at p pe pa sin hlt ug e casing an z me fied 11 th boiler, said boiler having ,spacgd ribs :01; the top thereof. p In testimony whereof I affix my gign-at l rg, HENRY A, LEQNHART. V. 

